阿花是阿兰家的保姆。某日，阿花无意中发现阿兰的房间里堆放着大量暴恐音视频和书籍。后公

识图说史：

图一
图二

（1）上面两幅图反映的是我国历史上的哪一重大战役？说出作战双方和时间？这次战争的结果？________________________________________________________________________________  （2）图二是与这次战争有关的一个成语典故。说出这个成语是什么？除此之外与本次战役还有关的几个成语是什么？________________________________________________________________________________  （3）这次战役是我国历史上以少胜多的战役，说出我们以前还学过这种类型的战役有哪些？________________________________________________________________________________

锯子的锯齿都“东倒西歪”，不在同一平面内．小明猜想这是为了减小锯木头时的阻力，并设计实验检验猜想．以下设计方案最佳的是 [ ]

A．用同一把拨正锯齿的锯子分别锯硬木头和软木头，比较用力情况

B．用同一把锯子，分别在“东倒西歪”和拨正锯齿时锯同一硬木头，比较用力情况

C．用一把“东倒西歪”和另一把拨正锯齿的锯子分别锯同一硬木头，比较用力情况

D．用一把“东倒西歪”和另一把拨正锯齿的锯子分别锯同一软木头，比较用力情况

现场心肺复苏操作首要步骤是（）

A.心前区叩击

B.心脏按压

C.口对口人工呼吸

D.按额托项，保持呼吸道通畅

E.心内注射

It has been hypothesized that much of the matter in the universe is "dark," i.e., unseen. Studies have shown that galaxies in many galaxy clusters are moving faster with respect to one another than they would if visible stars constituted all their mass. The studies suggest that the galaxies are moving under the gravitational influence of unseen mass in considerable quantity.
Which of the following is an assumption underlying the passage above

A．Measurements of the speed of moving galaxies are extremely unreliable.

B．The workings of gravitational forces are not particularly well understood.

C．The aggregate mass of visible stars in the galaxies mentioned above can be estimated with some confidence.

D．The general composition of unseen matter in the universe has been determined.

E．(E) Without exception, the galaxies mentioned above move toward one another.

主风机靠平衡轴向力（）

A、平衡盘

B、从动轴

C、轴瓦